發(fā)布時(shí)間：2018-04-15 19:15

  本文選題：長江干流 + 沉積物��； 參考：《環(huán)境科學(xué)學(xué)報(bào)》2017年11期

【摘要】：采集長江干流上、中、下游人口分布密集的主要城市江段、三峽庫區(qū)等19個(gè)監(jiān)測斷面的近岸沉積物樣品,分別分析了枯水期和豐水期沉積物樣品中砷、汞、銅、鉛、鎘、鋅和錳等重金屬含量在長江干流上的分布特征.結(jié)果表明,枯水期,砷和鉛在三峽庫區(qū)寸灘斷面含量最大,銅和汞在入江口含量最大.豐水期,長江干流最上游的兩個(gè)監(jiān)測斷面汞、砷、銅、鉛4種重金屬含量均較低;三峽庫區(qū)砷、銅、鉛3種重金屬總量均較大,汞含量也較高.依據(jù)相平衡分配法和沉積物污染指數(shù)法(SPI),選取銅和鉛兩項(xiàng)參數(shù),對長江干流近岸沉積物質(zhì)量進(jìn)行風(fēng)險(xiǎn)評估,結(jié)果顯示,長江干流19個(gè)監(jiān)測斷面近岸沉積物等級均為Ⅰ類,但入江口沉積物污染指數(shù)(SPI)值最大.
[Abstract]:The samples of inshore sediments from 19 monitoring sections of the Yangtze River, the main cities with dense population distribution in the middle and lower reaches of the Yangtze River and the three Gorges Reservoir area, were collected. The samples of arsenic, mercury, copper, lead and cadmium in the sediments during the dry and high water periods were analyzed, respectively.The distribution characteristics of heavy metals such as zinc and manganese in the main stream of the Yangtze River.The results show that the content of arsenic and lead in the section of the three Gorges Reservoir area is the highest, and that of copper and mercury is the highest in the estuary of the Yangtze River during the dry season.In the high water season, the mercury, arsenic, copper and lead contents in the two monitoring sections of the upper reaches of the main stream of the Yangtze River are all relatively low, and the total contents of arsenic, copper and lead in the three Gorges Reservoir area are all large, and the mercury content is also relatively high.According to the method of phase equilibrium distribution and the method of sediment pollution index (SPI), two parameters, copper and lead, are selected to assess the risk of sediment quality in the Yangtze River. The results show that the grades of the nearshore sediments in 19 monitoring sections of the Yangtze River are all classified as class 鈪，

本文編號：1755422